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require 'date'
require File.expand_path('../../../spec_helper', __FILE__)
describe "Date#-" do
it "subtracts a number of days from a Date" do
d = Date.civil(2007, 5 ,2) - 13
d.should == Date.civil(2007, 4, 19)
end
it "subtracts a negative number of days from a Date" do
d = Date.civil(2007, 4, 19).-(-13)
d.should == Date.civil(2007, 5 ,2)
end
it "computes the difference between two dates" do
(Date.civil(2007,2,27) - Date.civil(2007,2,27)).should == 0
(Date.civil(2007,2,27) - Date.civil(2007,2,26)).should == 1
(Date.civil(2006,2,27) - Date.civil(2007,2,27)).should == -365
(Date.civil(2008,2,27) - Date.civil(2007,2,27)).should == 365
end
it "raises an error for non Numeric arguments" do
lambda { Date.civil(2007,2,27) - :hello }.should raise_error(TypeError)
lambda { Date.civil(2007,2,27) - "hello" }.should raise_error(TypeError)
lambda { Date.civil(2007,2,27) - Object.new }.should raise_error(TypeError)
end
end
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